Chuck with wedge jaws



P. SCHULZ ET AL CHUCK WITH WEDGE JAWS Filed Feb. 28

MALL

Patented Aug. 5, 1924,

UNITED ySTA'FBS PATENT OFFICE.

PAUL SCHULZ, or BonENBncH-on-THE-ELBE, AAlvin; JULrUs JAKOWITSCH, or Kor/rome,

- CZECHOSLOVAKIA.

CHUCK WITH WEDGE JAWS.

Application mea February as, i922.` senarmjmassa To all whomc't may concern.' Y Be it known that we, PAUL SCHULZ and JULIUs J'Anowrrscn, citizens, respectively, of the German Republic and the Austrian ReH public, and residing at Bodenbachon-,the-

Elbe and Kometen, Czechoslovakia, have invented certainV new `and useful Improvements in Chucks with Wedge Jaws, of which the following is a specification. j, This invention relates to ach'uck with wedgej aws capable of exerting considerable pressure with the application of little force, the wedge jaws being adapted to be removed from the chuck and exchanged without necessitating the complete disassembling of the chuck, so that one and the same chuck may be used for holding rods of various diameters. In order that the invention may be clearly understood the same will be described with references Yto the accompanying drawings in which similar characters of .reference are employed in all of the views and wherein:

Fig. 1 is the form of construction of the chuck in longitudinal section,

Fig.;2 is a cross section online 2`2 of Fig. 1, i Fig. 3 is a side elevation of the arrangement shown in Fig. 1,

Figs. l and 5 show each in plan view a constructional detail, andV Fig. 6 theV side elevation of the arrangement'shown in Fig..5.` f

Referring now, more particularly, to the drawings the main part or body 1 of tthe chuck is reduced atv 2 and slotted to receive the wedge shaped clamping jaws 3.{ The reduced portion serves at 'the same time to guide the disk l the latter producing the movement `of t-,he clamping jaws 'lhe clamping jaws areV provided with incisionsV which areengagedby the! disk 4, the latter .being displaced axially by' rotation of the nut 5- ivhich. also act-s to simultanecuslydisplaoetlie jaws axially andmovethem either inwardlyl or outwarfdlyl AInf order td facilitate. the turning of the ,nut 5 the:.letter'` is .provided with teeth inthe'outer. suritace and'. is" surrounded ,byi a ring .7 provided in tur-'n with inner teeth 8. The initier diameter the incisions of the ring 7 is slightly largerthan the outer diameter of the nut5 sothat these two parts have. a different number of teeth..A For .instance, the nut 5 Vmaybe vprovided with sixty teeth and .the ring 7 withsixtyllfour teeth- These two partel act in the manner of# an e@centric-clriveV Theman part 1 has a nose 9 which is designed to engage with l0 on thering? and act; upon the shoulder 11 formed at the time the inicisions are made.

An outer sleeve @surrounding the main vpart-or body 1 and adapted to be turned with regard to the main part is provided internally with an eccentric rib 13 in turn having an incisionli therein. This eccentric rib lits exactly betweenl the flange l5 and the projection 16 of the ring 7 so that the ring may be displaced in both directions parallel to the middle line of the chuck by the axial displacement of the sleeve 12 provided the incision 14 ofthe outer sleeve 12 does `not register with the projection 16 of the rij-ng..A 1 c The ring-7 lit-ting the outer sleeve 1K2 is eccentrically mounted with regard to the nut 5 so thatonly a` few of the teeth of the ring 7 engage theteeth ofthe nut 5. The rotationof the chuck spindle and the chuck causes the rotation of the outer sleeve 12, the ring 7, the nut 5 and jaws 3 but if the outer sleeve is stopped, and thechuck spindle continues to rotate the ring 7 will execute an eccentric movement on the inner surface of the eccentric rib 13 and will impart by means of its internal teeth a rotary motion to the nut 5 whereby the disk 4 will be displaced in axial direction and the clamping jaws will be moved inwardly, Y This lin the jaw closing operation.. It is evident that relatively strong clamping pressure` maybe produced with.V a comparatively slight force exertedl upon the .outer `sl Ive,

owing to the eccentric drive and to the ec centr-1c. transmission by way of theeccentric drive, the inner thread, et the. nut 5V and the wedge movement of the.' clamping jaws'. -.T0

clamer) e rod in 'a machine Aor toclamp a; drill 'n. the drilling machinefspndle with tliead of the chuck it is merel/y necessary to insert with one hand the piece to be clamped into the opening of the chuck while the machine is ruiming and with the other hand to stop the outer sleeve 12 for a moment so that the hereinbefore described eccentric movement of the ring 7 takes place whereby the piece is clamped securely inV position. The outersleeve is now moved axially toward the main part 1 (to the right in Fig. 1), until the nose 9 of the latter enters the incision 10 of the ring 7 moved'inthe same direction and abuts the projection 11. Thus the ring 7 is linked to the main part 1 and cannot become loose during rotation by vibrations or the like'.

For releasing the piece of work it is merely necessary to uncouple the nose 9 from the projection 11 of the ring 7 by displacing the outer sleeve in the direction of the arrow 17 to the position shown in 1 so that the ring 7 may no longer participate in thev movement of the main part 1.

By further displacement in this directionV the outer sleeve 12 is coupled with the ring 7 as the rotating projection 16 engages with the incision 14 of the outer sleeve 12 Vas soon as both are arranged in registration.

A pin 18 is provided which limits the engagement of the projection 16 with the incision. By the operation` mentioned the outer sleeve 12 is united with the ring 7 and with the nut 5 engaging with said ring and, if the outer sleeve is now held while the chuck revolves the disk 4 screws back in the stationary nut so that the clamping jaws are opened. During this opening movement the'eccentric drive is not in operation andthe releasing is effected much more rapidly than the jaw clamping operation, which is especially advantageous. f

The parts above described are covered by a cap 19 screwed upon the outer end of the reduced portion 2 of the body or main part 1. By a stud 20 which is inserted and which reaches into the main part 1 the disk 4 is secured against revolving so that it is bound to execute in the nut 5 the movement in the longitudinal direction which has been described.

|This improved chuck can be used for various purposes, such as holding a rod in auvvtomatic machine tools, for clamping drills,

chasing tools or the like and it can be used directly for the cutting of threads by means of the jaws which must in this case be of special form, Vit being immaterial whether lthe pressure of the jaws is projected inwardly or outwardly. It is believed in view of the foregoing Vthat a further detailed description of the .operation of the invention is unnecessary.

. It is likewise believed that the advantages of the invention will be readily apparent.

` Ll-lavingthus fully described the invention what is claimed as new and desired to be secured by Letters Patent is: Y

1. An improved wedge chuck comprising in combination a. body, wedge shaped clamp ing jaws, a disk partly inserted in said clamping jaws and controlling same. a nut surrounding said diskand in threaded engagement-therewith for displacing the disk in an axial direction, a pin traversing the body and the disk in axial direction and designed `to prevent the disk from rotating, teeth on the outer` surface of said nut, a ring eccentrically mounted upon said nut, internal teeth on said ring engaging with the teeth of the nut, kan outer sleeve having'an eccentric rib inits b ore, rotatable on said body and adapted to be displaced upon said body in an axial direction, means on the outer su-rface of the said. ring to be enaged by the eccentric rib of the outer sleeve for longitudinally shifting the ring when the outer sleeve is axially displaced and means for coupling said ring with the body to lock the jaws in closed position.l Y 2. An improved wedge chuck comprising in combination a body, wedge shaped clamping jaws, a disk partly Vinsertedin said disk from rotating, teeth in the outer surface Vof said nut, a ringV eccentrically mounted upon said nut, internal teethon said ring engaging 'with the teeth of the nut, a flange atthe one edge and a projecnut surrounding said disk and in thread-:1i

tion at the other edge o f the ring, the flangeY havingV recesses formingV a tooth f therebetween, an outer sleeve having an eccentric rib in the bore fitting between ysaid flange and said projection on the ring and a nose in the'body for acting upon the tooth in the recesses of the flange for coupling the body with the ring and thereby locking the nut with the jaws in closed position when the Y outer sleeve is displaced in longitudinal direction.

3. An improved wedge chuck comprising in combination a body, wedge shaped clamping jaws, a disk partly yinserted in said clamping jaws and controlling same, a nut surrounding said'disk and in threaded en-y gagement with the disk for displacing the disk in an axial direction, a pin traversing the body and the disk in an axial direction and designed to prevent the disk from rotating, teeth in lthe outer surface of said nut, a ring eccentrically mounted upon said nut, internal teeth on -said ringengaging with the teethof the nut, a flange at the one edge and a projectionat the other .edge

of the ring, an outer sleeve having an eecen-- tric rib in its bore fitting between said body was rotating and thus operate to open 10 ange and said projection on the ring, said the jaws eccentric rib being provided with a groove In testimony whereof we aIiX our signadesigned to receive the projection of the tures in presence ott two witnesses.

ring-when the outer sleeve is displaced in PAUL SCHULZ. longitudinal direction for coupling it with JULIUS JAKOVITSCH. the said ring so that stopping of the outer Witnesses:

sleeve will cause rotation of the nut in Y T. En. LEVY,

- a direction opposite to that in which the WITFOELL REEGHL. 

